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Automobile body paint comparison method based on near infrared spectrum

A near-infrared spectroscopy and car body technology, applied in the field of car body paint comparison, can solve the problems of complex sample pretreatment process, inapplicable on-site operation, low work efficiency, etc.

Inactive Publication Date: 2019-05-14
西派特(北京)科技有限公司
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AI Technical Summary

Problems solved by technology

Che Zhiyong and others studied the application of infrared spectroscopy in the identification of car body coatings, and judged whether the car body paint has been re-sprayed by finding the difference in characteristic absorption peaks. However, this method has a complicated sample pretreatment process and low work efficiency. Not suitable for field operation

Method used

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  • Automobile body paint comparison method based on near infrared spectrum
  • Automobile body paint comparison method based on near infrared spectrum
  • Automobile body paint comparison method based on near infrared spectrum

Examples

Experimental program
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Embodiment Construction

[0015] Near Infrared Spectroscopy Data Acquisition

[0016] Select a rectangle on the car body panel and divide it into 10 rows and 161 columns, with a total of 1610 points. It is known that the paint on columns 1 to 132 of the rectangle is non-original paint, and the paint on columns 133 to 161 is original. factory paint. Use a near-infrared spectrometer, set the integration time to 40ms, and the average number of times to 3 times, and collect the spectral data of these 1610 points in sequence; use the same spectral collection method to randomly collect 80 points of near-infrared spectral data on the original paint standard plate; The spectral collection range is between 900 and 2100nm, such as figure 1 shown.

[0017] NIR Spectroscopy Data Preprocessing

[0018] Through the MATLAB software, using the first-order denoising derivation method, the collected 1610 sets of sample plate spectral data and 80 sets of standard plate spectral data were subjected to noise reduction a...

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Abstract

The invention discloses an automobile body paint comparison method based on a near infrared spectrum. A sample is compared with reference near infrared spectrum data by using a vector-subspace included angle algorithm, so that a difference between the two pieces of spectrum data is acquired, and thus whether the automobile body paint is different from the original paint is judged, and accordingly,whether the automobile body paint is repaired is judged.

Description

technical field [0001] The invention relates to a method for comparing automobile body paints, in particular to a method for comparing automobile body paints based on near-infrared spectroscopy. [0002] Car body paint comparison method. Background technique [0003] Many consumers find color difference, orange peel, damage and other phenomena in the partial paint film of the car body when buying second-hand cars, and suspect that the purchased car has been involved in a traffic accident or has undergone repainting and refurbishment. Perform technical appraisal. Then it is an urgent problem to establish a fast, accurate, non-destructive and high-throughput method for judging whether the automobile body paint is consistent with the original paint. [0004] Body paint is mainly composed of pigments, film-forming substances and additives, and contains organic compounds such as nitroresins, epoxy resins and amino resins. Che Zhiyong and others studied the application of infra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359G01N21/3563
Inventor 江伟陈诗建
Owner 西派特(北京)科技有限公司
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